I have a program on my web site that functions like that of Hot Or Not. You post your picture and get rated. To register you must enter your username, password, and email and then click on the activation link sent to your email. Yesterday, a robotic script signed up for my site 1700 times. I had to bring my site down to avoid a DDOS from my server. I am guessing the way to get around this is to embed a module that creates a random security code by pulling pictures of numbers, that you must enter to register. I have seen them before, yet I cannot find any scripts that have it in Perl. Please help, so I can put my site back up ASAP. If there is another solution please advise.

That sounds good and everything, but what is the actual programming involved. I am not familiar with Perl so I don not know how to write the script. Could you tell me what to search for on HotScripts or show me how to write it? Thanks.